![]() ![]() If you read the datasheet and compare the topology of this board you will find that the manufacturer has followed the build and layout recommendations from XMOS. CN1 is for external powering (instead of using USB power). Here is place to add larger caps and increase the filtering. The 2 LC filters for filtering the output from the built in DC-DC converters. You can bypass the USB power by removing FB1 and provide external 5V. The local ultra low noise LDO (excuse the left over cotton fibers from my cleaning :-)). Looks like the enable pin is controlled by the XMOS chip, enabling/disabling the clocks for the corresponding sample rate. According to the datasheet, pin 1 is the enable pin and pin 3 is the output pin. The previous generation XMOS devices required a separate USB interface chip (foto from here: ): Here is the datasheet of one version of the part: But it is definitely a “U” part as there is no separate USB controller chip. Ĭannot tell from the chip markings what part is it. Follow the discussion of this board and XMOS technology in general in the diyaudio thread.
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